import 'package:flutter/material.dart';

import '../../core/theme/app_colors.dart';

class FeaturePage extends StatelessWidget {
  final String title;
  final String subtitle;
  final Widget child;
  final Widget? trailing;

  const FeaturePage({
    super.key,
    required this.title,
    required this.subtitle,
    required this.child,
    this.trailing,
  });

  @override
  Widget build(BuildContext context) {
    return SafeArea(
      child: LayoutBuilder(
        builder: (context, constraints) {
          final short = constraints.maxHeight < 520;
          final compact = constraints.maxWidth < 420 || short;
          final wide = constraints.maxWidth >= 900;
          final horizontal = compact ? 12.0 : 20.0;
          return Padding(
            padding: EdgeInsets.fromLTRB(
              horizontal,
              short ? 8 : 12,
              horizontal,
              short ? 10 : 14,
            ),
            child: Center(
              child: ConstrainedBox(
                constraints: BoxConstraints(
                  maxWidth: wide ? 1160 : double.infinity,
                ),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    TweenAnimationBuilder<double>(
                      tween: Tween(begin: 12, end: 0),
                      duration: const Duration(milliseconds: 360),
                      curve: Curves.easeOutCubic,
                      builder: (_, offset, child) => Opacity(
                        opacity: (1 - offset / 12).clamp(0.0, 1.0),
                        child: Transform.translate(
                          offset: Offset(0, offset),
                          child: child,
                        ),
                      ),
                      child: compact
                          ? Column(
                              crossAxisAlignment: CrossAxisAlignment.start,
                              children: [
                                _FeatureHeading(
                                  title: title,
                                  subtitle: subtitle,
                                  compact: compact,
                                ),
                                if (trailing != null) ...[
                                  const SizedBox(height: 10),
                                  Align(
                                    alignment: Alignment.centerLeft,
                                    child: trailing!,
                                  ),
                                ],
                              ],
                            )
                          : Row(
                              children: [
                                Expanded(
                                  child: _FeatureHeading(
                                    title: title,
                                    subtitle: subtitle,
                                    compact: compact,
                                  ),
                                ),
                                if (trailing != null) trailing!,
                              ],
                            ),
                    ),
                    SizedBox(height: short ? 8 : (compact ? 12 : 16)),
                    Expanded(
                      child: child,
                    ),
                  ],
                ),
              ),
            ),
          );
        },
      ),
    );
  }
}

class _FeatureHeading extends StatelessWidget {
  final String title;
  final String subtitle;
  final bool compact;

  const _FeatureHeading({
    required this.title,
    required this.subtitle,
    required this.compact,
  });

  @override
  Widget build(BuildContext context) {
    final short = MediaQuery.sizeOf(context).height < 520;
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text(
          title,
          maxLines: short ? 1 : 2,
          overflow: TextOverflow.ellipsis,
          style: Theme.of(context).textTheme.headlineSmall?.copyWith(
                fontSize: compact ? 22 : null,
                fontWeight: FontWeight.w900,
                color: AppColors.text,
              ),
        ),
        const SizedBox(height: 2),
        Text(
          subtitle,
          maxLines: short ? 1 : (compact ? 2 : 3),
          overflow: TextOverflow.ellipsis,
          style: const TextStyle(
            color: AppColors.muted,
            fontWeight: FontWeight.w500,
            height: 1.25,
          ),
        ),
      ],
    );
  }
}

class FeatureEmptyPanel extends StatelessWidget {
  final IconData icon;
  final String title;
  final String message;
  final Widget? action;

  const FeatureEmptyPanel({
    super.key,
    required this.icon,
    required this.title,
    required this.message,
    this.action,
  });

  @override
  Widget build(BuildContext context) {
    return Center(
      child: ConstrainedBox(
        constraints: const BoxConstraints(maxWidth: 360),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Container(
              width: 72,
              height: 72,
              decoration: BoxDecoration(
                color: AppColors.primary.withValues(alpha: 0.08),
                borderRadius: BorderRadius.circular(8),
                border: Border.all(color: AppColors.border),
              ),
              child: Icon(icon, size: 36, color: AppColors.primary),
            ),
            const SizedBox(height: 12),
            Text(
              title,
              textAlign: TextAlign.center,
              style: const TextStyle(fontSize: 18, fontWeight: FontWeight.w800),
            ),
            const SizedBox(height: 6),
            Text(
              message,
              textAlign: TextAlign.center,
              style: const TextStyle(color: AppColors.muted, height: 1.35),
            ),
            if (action != null) ...[
              const SizedBox(height: 16),
              action!,
            ],
          ],
        ),
      ),
    );
  }
}

class FeatureErrorPanel extends StatelessWidget {
  final String message;
  final VoidCallback? onRetry;

  const FeatureErrorPanel({
    super.key,
    required this.message,
    this.onRetry,
  });

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Container(
        width: double.infinity,
        constraints: const BoxConstraints(maxWidth: 420),
        padding: const EdgeInsets.all(18),
        decoration: BoxDecoration(
          color: const Color(0xFFFEF2F2),
          borderRadius: BorderRadius.circular(8),
          border: Border.all(color: const Color(0xFFFECACA)),
        ),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            const Icon(Icons.error_outline, color: Color(0xFFDC2626), size: 34),
            const SizedBox(height: 10),
            Text(
              message,
              textAlign: TextAlign.center,
              style: const TextStyle(color: Color(0xFF991B1B), height: 1.35),
            ),
            if (onRetry != null) ...[
              const SizedBox(height: 12),
              FilledButton.icon(
                onPressed: onRetry,
                icon: const Icon(Icons.refresh),
                label: const Text('Coba lagi'),
              ),
            ],
          ],
        ),
      ),
    );
  }
}